U.S. patent application number 12/004931 was filed with the patent office on 2008-07-03 for wheelchair seat back mount assembly and wheelchair therewith.
This patent application is currently assigned to Sunrise Medical HHG Inc.. Invention is credited to Vasily G. Tsuber, Thomas J. Whelan.
Application Number | 20080157581 12/004931 |
Document ID | / |
Family ID | 39262651 |
Filed Date | 2008-07-03 |
United States Patent
Application |
20080157581 |
Kind Code |
A1 |
Whelan; Thomas J. ; et
al. |
July 3, 2008 |
Wheelchair seat back mount assembly and wheelchair therewith
Abstract
An assembly for mounting a seat back shell to a wheelchair seat
back cane comprises a first portion attachable to the seat back
cane and a second portion attachable to the seat back shell. The
portions mate to form a point of attachment by aligning one of the
portions with the other portion and displacing one of the portions
in relation to the other portion.
Inventors: |
Whelan; Thomas J.;
(Longmont, CO) ; Tsuber; Vasily G.; (Thornton,
CO) |
Correspondence
Address: |
MACMILLAN SOBANSKI & TODD, LLC
ONE MARITIME PLAZA FIFTH FLOOR, 720 WATER STREET
TOLEDO
OH
43604-1619
US
|
Assignee: |
Sunrise Medical HHG Inc.
|
Family ID: |
39262651 |
Appl. No.: |
12/004931 |
Filed: |
December 21, 2007 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60878293 |
Jan 3, 2007 |
|
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|
Current U.S.
Class: |
297/440.2 |
Current CPC
Class: |
A61G 5/122 20161101;
A61G 2210/10 20130101; A61G 5/1067 20130101; A61G 5/12
20130101 |
Class at
Publication: |
297/440.2 |
International
Class: |
A47C 7/00 20060101
A47C007/00 |
Claims
1. An assembly for mounting a seat back shell to a wheelchair seat
back cane, the assembly comprising: a first portion attachable to
the seat back cane, and a second portion attachable to the seat
back shell, the portions mating to form a point of attachment by
aligning one of the portions with the other portion and displacing
one of the portions in relation to the other portion.
2. The assembly of claim 1 wherein the shell is attachable to two
spaced apart seat back canes, thus forming two points of
attachment.
3. An assembly for mounting a seat back shell to a wheelchair seat
back cane, the assembly comprising: a first portion attachable in
relation to the seat back cane; and a second portion attachable in
relation to the seat back shell, the second portion being
configured to receive the first portion and rotate in relation to
the first portion to lock the second portion in relation to the
first portion.
4. The assembly of claim 3 wherein the first portion comprises a
tube clamp that is attachable in relation to the seat back
cane.
5. The assembly of claim 4 wherein the tube clamp comprises a first
part and a second part hinged in relation to the first part.
6. The assembly of claim 5 wherein the second part is hinged in
relation to the first part in a plurality of positions to
accommodate different size seat back canes.
7. The assembly of claim 4 wherein the first portion further
comprises a mounting block attachable in relation to the tube
clamp, the second portion being configured to receive the mounting
block and rotate in relation to the mounting block to lock the
second portion in relation to the first portion.
8. The assembly of claim 7 wherein the mounting block is attachable
in relation to the tube clamp in a plurality of positions to adjust
the angle of the seat back shell in relation to the seat back
canes.
9. The assembly of claim 7 wherein the mounting block is pivotally
adjustable in relation to the tube clamp in any one of the
plurality of positions to accommodate different shaped back
canes.
10. The assembly of claim 3 wherein the second portion comprises a
mounting bracket that is attachable in relation to the seat back
shell.
11. The assembly of claim 10 wherein the mounting bracket is
adjustable in relation to the seat back shell.
12. The assembly of claim 10 wherein the mounting bracket is
laterally adjustable in relation to the seat back shell.
13. The assembly of claim 3 wherein the first portion comprises a
mounting block and the second portion comprises a mounting bracket,
the mounting bracket comprising a radial opening and an axial
opening, the radial opening permitting passage of the mounting
block when oriented in a first orientation and preventing passage
of the mounting block when oriented in a second orientation, the
axial opening restricting axial passage of the mounting block.
14. The assembly of claim 13 wherein the mounting block comprises
an inner portion and an outer portion, the inner portion comprising
a substantially circular shaped portion and a kidney shaped portion
with a necked-down portion therebetween, the outer portion defining
a first flange, and wherein the mounting bracket is substantially
C-shaped and comprises an inner portion defining a second flange,
the axial opening being bound by the second flange and having a
shape complementary to the mounting block inner portion, the first
and second flanges being dimensioned and configured to restrict
axial passage of the mounting block inner portion through the
mounting bracket.
15. An assembly for mounting a seat back shell to spaced apart
wheelchair seat back canes, the assembly comprising: a pair of
first portions, the first portions being attachable in relation to
the seat back canes; and a pair of second portions, the second
portions being attachable in relation to opposing sides of the seat
back shell, the second portions being configured to receive the
first portions and rotate in relation to the first portions to lock
the second portions in relation to the first portions and thus form
a two-point mounting assembly.
16. The assembly of claim 15 wherein the first portions each
comprises a tube clamp attachable in relation to the seat back
canes, the tube clamp comprising a first part and a second part
hinged in relation to the first part in a plurality of positions to
accommodate different size seat back canes.
17. The assembly of claim 16 wherein the first portions each
comprises a mounting block attachable in relation to the tube
clamp, the second portions being configured to receive the mounting
blocks and rotate in relation to the mounting blocks to lock the
second portions in relation to the first portions.
18. The assembly of claim 17 wherein the mounting blocks are
attachable in relation to the tube clamps in a plurality of
positions to adjust the angle of the seat back shell in relation to
the seat back canes.
19. The assembly of claim 15 wherein the second portions each
comprise a mounting bracket that is attachable in relation to the
seat back shell, the mounting bracket being laterally adjustable in
relation to the seat back shell.
20. The assembly of claim 15 further comprising a pair of hooks,
the hooks each being attachable in relation to the seat back shell
below the second portions.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional
Application No. 60/878,293, filed Jan. 3, 2007, the disclosure of
which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] This invention relates in general to wheelchairs and more
particularly to wheelchair seat back mount assemblies.
SUMMARY OF THE INVENTION
[0003] This invention relates to an assembly for mounting a seat
back shell to a seat back cane of a wheelchair. The assembly
comprises a first portion attachable to the seat back cane and a
second portion attachable to the seat back shell. The portions mate
to form a point of attachment by aligning one of the portions with
the other portion and displacing one of the portions in relation to
the other portion.
[0004] Various aspects of this invention will become apparent to
those skilled in the art from the following detailed description of
the preferred embodiment, when read in light of the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0005] FIG. 1 is a partially exploded, environmental perspective
view of a seat back mount assembly.
[0006] FIG. 2 is an enlarged-scale, exploded perspective view of
the assembly shown in FIG. 1.
[0007] FIG. 3 is an enlarged-scale, exploded perspective view of an
adjustable clamp of the assembly shown in FIG. 1.
[0008] FIG. 4 is a reduced-scale, environmental partial rear
perspective view of the assembly shown in FIG. 1.
[0009] FIGS. 5A-5B are perspective views of a seat back being
located and installed with the seat back mount assembly as shown in
FIG. 1.
[0010] FIGS. 6A-6F are enlarged, elevational views of a mounting
block and a c-shaped mounting bracket of the assembly shown in FIG.
1 at various stages of cooperation.
[0011] FIG. 7 is a cross-sectional view of the mounting block and
the c-shaped mounting bracket taken along the lines 7-7 in FIG.
6F.
[0012] FIG. 8 is an enlarged-scale, exploded perspective view of a
bottom hook for use with the assembly shown in FIG. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0013] Referring now to the drawings, there is illustrated in FIG.
1 a partially exploded, environmental perspective view of a
wheelchair seat back mount assembly 10. The assembly 10 may be
comprised of two portions, a first portion, generally indicated at
12, that may be attachable in relation to the wheelchair seat back
canes 14 and a second portion, generally indicated at 16, that may
be attachable in relation to the wheelchair seat back shell 18.
These two portions 12, 16 may mate to form an easy-to-use
assembly.
[0014] In the exemplary embodiment shown in FIG. 2, the first
portion 12 may include a clamp bracket having a first part, which
may be in the form of a tube clamp plate 20, and a second part,
which may be in the form of a tube clamp hinge 22a that may
cooperate with the tube clamp plate 20. The tube clamp plate 20 may
have a relatively planar main body portion 20a and a curved or
hooked portion, generally indicated at 20b, extending from the main
body portion 20a. Spaced fingers 20c may extend from the hooked
portion 20b. Aligning holes 20d in the fingers 20c may receive a
dowel pin 24, which may fit tightly in the holes 20d. The tube
clamp hinge 22 may have a curved or hooked portion 22a, which may
be similar to the hook portion 20b of the tube clamp plate 20. A
tab 22b may extend from the hooked portion 22a. The tab 22b may be
sized to fit between the fingers 20c. A groove 22c on the tabs may
engage the dowel pin 24 to form a connection between the tube clamp
plate 20 and the tube clamp hinge 22. The engaging groove 22c and
dowel pin 24, in effect, may form a hinge. Multiple grooves, such
as the two grooves 22c shown, may be provided for selective
engagement with the dowel pin 24 to adjust the size of the clamp
bracket, as will become apparent in the description that follows. A
tongue 22d may extend from the hooked portion 22a, opposite the tab
22b. One or more bores 22e may pass the tongue 22d. One or more
fasteners 26, such as the cap screws shown, may pass through the
bores 22e, which may be counter bores, in the tongue 22d and may be
threaded into aligning threaded holes 20e in the main body portion
20a of the clamp bracket to fasten the tongue 22d of the tube clamp
hinge 22 to the main body portion 20a of the tube clamp plate 20.
The fasteners 26 may be threaded into nuts, such as the lock nuts
shown, on the opposite side (i.e., the blind side when viewing FIG.
2) of the main body portion 20a. The nuts may be recessed in
hexagonal holes in the main body portion 20a so that the hexagonal
holes prevent the nuts from turning.
[0015] In the exemplary embodiment, a mounting block 28 may be
supported in relation to the clamp bracket, such as in relation to
the tube clamp plate 20 or in relation to the main body portion 20a
of the tube clamp plate 20. The mounting block 28 may be mounted
with one or more fasteners 30, such as the cap screws shown. For
example, one or more bores 20g, which may be counter bores, may be
provided through the main body portion 20a and may align with holes
28a, 28b through the mounting block 28. The fasteners 30 may pass
through the bores 20g in the main body portion 20a and further
through aligning holes 28a, 28b in the mounting block 28. The
fasteners 30 may then be threaded into nuts, such as the lock nuts
shown, on the opposite side of the mounting block 28. The nuts may
be recessed in holes in the mounting block 28 (i.e., the blind side
when viewing FIG. 2). The holes may be dimensioned and configured
to prevent the nuts from turning.
[0016] It should be noted that the main body portion 20a may have a
plurality of bores 20g, including three sets or pairs of bores.
Each pair may be arranged to support the seat back shell 18 at a
different angle. For example, the three pairs of bores may support
the seat back shell 18 at 0, 5, and 10 degrees (i.e., relative to
vertical when viewing FIG. 1). The main body portion 20a may be
provided with indicia, as shown in FIG. 3, corresponding with each
pair of bores to indicate the angular disposition of the seat back
shell 18 if a corresponding pair of bores is used.
[0017] It should further be noted that at least one of the holes
28b through the exemplary mounting block 28 may be curved or
arcuate in shape to permit the mounting block 28 to pivot when the
fasteners 30 are loosened, such as along the line B-B shown in FIG.
4. In particular, the mounting block 28 may have two holes 28a,
28b. Two fasteners 30 may pass through the two holes 28a, 28b. One
fastener 30 passing through one hole 28a may function as a pivot.
The other fastener 30 may pass through the other hole 28b, which
may be curved or arcuate in shape. In this way, the mounting block
28 may be able to pivot on the one fastener 30 as the mounting
block 28 moves in relation to the other fastener 30 due to the
provision of the curved or arcuate shaped hole 28b.
[0018] As shown in FIG. 2, the exemplary mounting block 28 may have
a substantially circular shaped portion 28c and a substantially
oval or kidney shaped portion 28d separated by a necked-down
portion 28e, when viewed from a point parallel or along the axes
A1, A2 of the holes 28a, 28b therethrough. The hole 28a for the
fastener 30 that may function as a pivot passes through the
circular portion 28c. The arcuate shaped hole 28b may pass through
the substantially oval or kidney shaped portion 28d. Additionally,
the mounting block 28 may have a first or outer portion 28f and a
second or inner portion 28g, which may be reduced in size so as to
be smaller in dimension when viewed from a point transverse or
crosswise from the axes A1, A2 of the holes 28a, 28b therethrough.
The larger outer portion 28f may form a first flange that extends
radially outward in relation to the inner portion 28g. A
substantially pointed guide 28h may extend (upwardly when viewing
FIG. 2) from the top of the flange.
[0019] The second portion 16 of the assembly 10 may include a
substantially C-shaped mounting bracket having a first or outer
portion 16a and a second or inner portion 16b, which may be of a
different size or dimension relative to the outer portion 16a so
that the inner portion 16b may form a second flange that may extend
radially inward in relation to the outer portion 16a. The C-shaped
mounting bracket may define a radial opening 16d and the flange may
define an axial opening 16e. The radial opening 16d may permit
passage of the mounting block 28 when aligned or oriented in a
first orientation and prevents passage of the mounting block 28
when displaced or oriented in a second orientation. The axial
opening 16e may restrict axial passage of the mounting block 28
when in the second orientation. The outer portion 16a may be
dimensioned and configured to be substantially complementary in
shape to the outer portion 28f of the mounting block 28, and may
include, for example, a region, such as the radial opening 16d or
channel 16d shown in FIG. 7, into which the pointed guide 28h may
be inserted. The inner portion 16b may be dimensioned and
configured to be substantially complementary in shape to the outer
portion 28f of the mounting block 28. The two flanges may cooperate
to form an attachment between the mounting block 28 and the
C-shaped mounting bracket when oriented in a certain orientation
(e.g., the first orientation) in relation to one another, as will
become more apparent in the description that follows.
[0020] The exemplary C-shaped mounting bracket may be mounted in
relation to the seat back shell 18 by a top mount bracket 32. The
exemplary top mount bracket 32 is a substantially L-shaped or
V-shaped bracket having one or more holes or slots 32a therein that
permit adjustment, such as lateral adjustment, of the top mount
bracket 32 in relation to the seat back shell 18. The C-shaped
mounting bracket may have one or more bores 16c, such as the
counter bores shown, passing therethrough. The top mount bracket 32
may have threaded holes 32b that may align with the bores 16c.
Fasteners 38, such as the cap screws shown, may pass through the
bores 16c and be threaded into the holes 32b to fasten the C-shaped
mounting bracket to the top mount bracket 32. The top mount bracket
32 may, in turn, be fastened to the seat back shell 18 in any
suitable manner, such as via the stud plate 40, washers 39, and
nuts 41 (e.g., locknuts) shown.
[0021] Referring back to FIG. 1, a mounting block 28 is shown
fastened in relation to each seat cane 14 and a C-shaped mounting
bracket is fastened in relation to each side of the seat back shell
18. An attachment may be formed between each mounting block 28 and
a corresponding C-shaped mounting bracket. This may form two points
of attachment of the seat back shell 18 in relation to the seat
back canes 14. With the mounting block 28 and the C-shaped mounting
bracket installed in relation to the seat back canes 14 and the
seat back shell 18, the seat back shell 18 may be easily installed
by aligning the second portions 16 in relation to (e.g. over) the
first portions 12 and then rotating, or otherwise displacing, the
seat back shell 18 downward into a positive latched position, as
depicted in FIGS. 5A-5B.
[0022] With the provision of only two points of attachment, it may
be simple to align the mounting block 28 with the C-shaped mounting
bracket. With the mounting block 28 and the C-shaped mounting
bracket aligned, the mounting block 28 may be inserted into the
C-shaped mounting bracket with the pointed guide 28h entering the
channel 16d of the C-shaped mounting bracket, as shown in FIGS.
6A-6B. The seat back shell (not shown) may then be rotated or
pivoted (e.g., in a clockwise direction when viewing FIG. 6D) or
otherwise displaced until the pointed guide 28h makes abutting
contact with the C-shaped mounting bracket at the end of the
channel 16d and the substantially oval or kidney shaped portion 28d
of the mounting block 28 makes abutting contact with a
corresponding portion of the C-shaped mounting bracket, as shown in
FIGS. 6E-6F. The abutting contact may resist further rotation or
pivotal movement of the seat back shell 18 (e.g., in a clockwise
direction when viewing FIG. 6D).
[0023] As shown in FIG. 7, the respective flanges of the mounting
block 28 and the C-shaped mounting bracket may cooperate to prevent
lateral movement of the mounting block 28 and the C-shaped mounting
bracket in relation to one another to form a point of attachment on
each seat back cane 14.
[0024] To supplement the support provided by the two points of
attachment, a bottom hook 42, shown in FIG. 8, may be attached to
each side of the seat back shell 18 at a lower portion of the seat
back shell 18 (i.e., below the attachment points). The exemplary
bottom hooks 42 may be provided with one or more holes or slots 42a
therein that permit lateral adjustment of the bottom hooks 42 in
relation to the seat back shell 18. This may permit proper
alignment of the bottom hooks 42 in relation to the seat back canes
14. As shown in FIG. 1, the bottom hooks 42 may abut the seat back
canes 14 to limit movement of the lower portion to the seat back
shell 18 in relation to the canes 14. The bottom hooks 42 may be
fastened to the seat back shell 18 in any suitable manner, such as
with the stud plates 44, washers 46 and nuts 48 shown. The nuts 48
may be lock nuts. A covering material 50, such as a plastic or
rubber covering may cover the bottom hooks 42 to provide a
relatively resilient contact between the bottom hooks 42 and the
canes 14.
[0025] It should be noted that different shaped back canes can be
accommodated by the pivotal adjustment of the mounting block 28 in
relation to the tube clamp plate 20. This may further insure that
the bottom hooks 42 are properly aligned with the seat back canes
14. For example, different back canes may be at different angles
relative to vertical, or not may not follow a straight line and
thus have portions that are at different angles relative to
vertical. In these cases, the orientation of the mounting block 28
may be pivotally adjusted in relation to the back canes, depending
on the angle of the back cane in relation to vertical at the point
which the mounting block 28 is mounted to the back cane.
[0026] To accommodate different diameter canes 14, the clamp
bracket may be adjustable. As described above, the clamp bracket
may have a tube clamp plate 20 with a pin 24 and a tube clamp hinge
22 with grooves 22c that may be selectively engageable with the pin
24 so the clamp 22 may be used with different sized seat back canes
14. For example, one groove may accommodate 7/8 inch (22 mm)
diameter canes while another groove may accommodate 1 inch (25 mm)
diameter canes.
[0027] Most of the load applied on the seat back shell 18 may be
applied in the shoulder area of the shell 18. The main attachment
points of the assembly 10 may be in the same area, providing good
support and minimizing risk that the seat back shell 18 will become
unintentionally detached.
[0028] It should be appreciated that the clamp bracket and top
mount bracket are exemplary brackets and other forms of connection
may be provided for the mounting block 28 and the C-shaped mounting
bracket. It should further be appreciated that the mounting block
28 and the C-shaped mounting bracket are exemplary embodiments and
that the mounting block and the mounting bracket may take on other
shapes or forms. Further, the fasteners 26, 30, 38 and stud plates
40, 44 are exemplary fasteners and other fasteners may be employed.
The bottom hook 42 is described for exemplary purposes and other
structure may be suitable for use in the place of the bottom hooks
42.
[0029] It should be appreciated that the mounting block and
mounting bracket may be cooperatively configured in any suitable
manner, whereby at least one of either the mounting block or
mounting bracket may be oriented in such a way to cooperate with
the other one of either the mounting block or mounting bracket,
such as by insertion, and then displaced, such as by rotation or
other suitable displacement, to interlock the mounting block and
the mounting bracket. The axial opening is provided as an example
of a captive or restrictive opening, which may be defined by an
annular flange or other suitable structure or configuration. Other
structure may be suitable for interlock the mounting block and the
mounting bracket. Further, the pointed guide functions in
cooperation with the mounting bracket as an interference member. It
should be appreciated that other structure may be suitable for
functioning as an interference member.
[0030] The principle and mode of operation of this invention have
been explained and illustrated in its preferred embodiment.
However, it must be understood that this invention may be practiced
otherwise than as specifically explained and illustrated without
departing from its spirit or scope.
* * * * *